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Theorem sltssn 28043
Description: Surreal set less-than of two singletons. (Contributed by Scott Fenton, 17-Mar-2025.)
Hypotheses
Ref Expression
sltssn.1 (𝜑𝐴 No )
sltssn.2 (𝜑𝐵 No )
sltssn.3 (𝜑𝐴 <s 𝐵)
Assertion
Ref Expression
sltssn (𝜑 → {𝐴} <<s {𝐵})

Proof of Theorem sltssn
StepHypRef Expression
1 sltssn.3 . 2 (𝜑𝐴 <s 𝐵)
2 sltssn.1 . . 3 (𝜑𝐴 No )
3 sltssn.2 . . 3 (𝜑𝐵 No )
42, 3sltssnb 28042 . 2 (𝜑 → ({𝐴} <<s {𝐵} ↔ 𝐴 <s 𝐵))
51, 4mpbird 260 1 (𝜑 → {𝐴} <<s {𝐵})
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wcel 2145  {csn 4587   class class class wbr 5107   No csur 27884   <s clts 27885   <<s cslts 28030
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2734  ax-sep 5255  ax-pr 5402
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2741  df-cleq 2754  df-clel 2837  df-ral 3079  df-rex 3089  df-rab 3415  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4283  df-if 4486  df-sn 4588  df-pr 4590  df-op 4594  df-br 5108  df-opab 5172  df-xp 5665  df-slts 28031
This theorem is used by:  cutneg  28089  zcuts  28680  twocut  28696  nohalf  28697  pw2recs  28711  halfcut  28731  addhalfcut  28732  pw2cut2  28735  bdaypw2n0bndlem  28736  bdayfinbndlem1  28740
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